Ion Fury is a prequel to Bombshell. Shelly "Bombshell" Harrison, a bomb disposal expert working for the Global Defense Force (GDF), returns as the game's protagonist, fighting against the cybernetic forces of Dr. Jadus Heskel.
The game is built in a modified version of the EDuke32 source port of the famed Build engine that powered Duke Nukem 3D, Shadow Warrior, and Blood, which brings modern additions to an otherwise quite old-school experience, such as high resolution support, higher-quality textures, and autosaves running alongside regular manual game saving options, while retaining the bulk of the gameplay from these titles.
On 28 February 2018, the Preview Campaign was released, having but one short episode that ends in a boss fight. Shelly has four weapons available to her, with her signature three-barreled revolver and homing bombs first seen in Bombshell also making a return. The game prides itself in the level of interactivity with the environment, and rewards exploration and uncovering secrets, some of which bring bonuses like health, armour and/or ammo pickups.
3D Realms was sued over the games original title Ion Maiden by the band Iron Maiden. Iron Maiden claimed trademark infringement over the name of the game and its logo being extremely similar to theirs.